title: Progression of lumbar spinal stenosis is influenced by polymorphism of thrombospondin 2 gene in the Korean population.
abstract: OBJECTIVE
  The aim of this study is to determine the contribution of thrombospondin 2 (THBS2) polymorphisms to the development and progression of lumbar spinal stenosis (LSS) in the Korean population.
  
  
  METHODS
  We studied 148 symptomatic patients with radiographically proven LSS and 157 volunteers with no history of back problems from our institution. Magnetic resonance images were obtained for all the patients and controls. Quantitative image evaluation for LSS was performed to evaluate the severity of LSS. All patients and controls were genotyped for THBS2 allele variations using a polymerase chain reaction-based technique.
  
  
  RESULTS
  We found no causal single nucleotide polymorphism (SNPs) in THBS2 that were significantly associated with LSS. Two SNPs (rs6422747, rs6422748) were over-represented in controls [P = 0.042, odds ratio [OR] = 0.55 and P = 0.042, OR = 0.55, respectively]. Haplotype analysis showed that the ''AGAGACG'' haplotype (HAP4) and ''AAGGACG'' haplotype (HAP5) were over-represented in severe LSS patients (P = 0.0147, OR = 2.02 and P = 0.0137, OR = 2.48, respectively). In addition, the ''AAAGGGG'' haplotype (HAP1) was over-represented in controls (P = 0.0068, OR = 0.30).
  
  
  CONCLUSIONS
  Although no SNPs in THBS2 were associated with LSS, haplotypes (HAP4 and HAP5) were significantly associated with progression of LSS in the Korean population, whereas another haplotype (HAP1) may play a protective role against LSS development.
authors.affiliation: Department of Neurosurgery, Spine Center, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Republic of Korea.
authors.forename: Seung-Jae
authors.initials: SJ
authors.lastname: Hyun
authors.forename: Borae G
authors.initials: BG
authors.lastname: Park
authors.forename: Seung-Chul
authors.initials: SC
authors.lastname: Rhim
authors.forename: Jun-Won
authors.initials: JW
authors.lastname: Jang
authors.forename: Sang-Ryong
authors.initials: SR
authors.lastname: Jeon
authors.forename: Sung-Woo
authors.initials: SW
authors.lastname: Roh
mesh_terms: D000328:Adult; D000483:Alleles; D044466:Asian People / Q000235:genetics; D005260:Female; D005838:Genotype; D006239:Haplotypes / Q000235:genetics*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D016133:Polymerase Chain Reaction; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D056910:Republic of Korea; D013130:Spinal Stenosis / Q000235:genetics* / Q000503:physiopathology*; D019699:Thrombospondins / Q000235:genetics*; D000099262:Thrombospondin 2
chemical_list: D019699:Thrombospondins; D000099262:Thrombospondin 2